CODEWITHSUNDEEP
rwhile-loop
user2458552
user2458552

Reputation: 419

Error: missing value where TRUE/FALSE needed in while loop

I am trying to write a program using a while loop:

n=50
sum=array(0,n)
sum[1]=0
for(k in 1:n)
{
   sum[k+1]=sum[k]+k
   while((sum[k+1]-sum[k])<10)
   {
      print(sum[k+1])
      k=k+1
   }
}
sample=data.frame(Sum=sum) sample

its showing: 

Error in while ((sum[k + 1] - sum[k]) < 10) { : 
  missing value where TRUE/FALSE needed

Can anyone tell what is wrong with this code?

Upvotes: 1

Views: 11434

Answers (1)

Maroun
Maroun

Reputation: 96016

In the second iteration sum[k+1] = NA since it'll be evaluated to:

(sum[2+1]-sum[1])<10 where sum[2+1] = sum[3] is NA. So (sum[k+1]-sum[k])<10 will not be evaluated to one of TRUE/FALSE.

Iteration (k) | sum[k+1]-sum[k]
--------------+------------------
      1       | sum[2] - sum[1]   They're both known
      2       | sum[3] - sum[2]   What is sum[3]? (NA)

Upvotes: 2

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